Heirloom Tomato Ketchup

This recipe for heirloom tomato ketchup dates back to 1908. It is sugar-free, depending on the natural sugar in the tomatoes to concentrate as a sweetener. It is fairly simple with the main ingredients being tomatoes, vinegar, red peppers, salt, pepper, dry mustard, and allspice. Be prepared to tend it for 4 hours before canning.